Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca9cac475a13fda…

MALICIOUS

PDF

78.2 KB Created: 2021-06-07 21:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 154b0658382be4972c9bde7046728f0d SHA-1: 5badf4eab8a24660105950ae4c538977ffd1e820 SHA-256: bca9cac475a13fda041b0a5644efa5ebae24a3b7f36b790b8db535a8d390a75e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/pbw?utm_term=intermittent+fasting+workout+schedule+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388819/normal_602b466a5446e.pdfIn PDF document text
    • https://sanivuledaxefe.weebly.com/uploads/1/3/4/2/134234591/jowokawexoba_komiwu_jozerifitolib_kexebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412377/normal_602046e5d3276.pdfIn PDF document text
    • https://weritudasokapo.weebly.com/uploads/1/3/4/4/134494226/a93fd5e4faa8e6.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/e25a753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_6034de919a703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480893/normal_600cc3df792f0.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/bewulex.pdfIn PDF document text
    • https://zaboxunur.weebly.com/uploads/1/3/4/3/134369304/2451159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461232/normal_5fd2fe2a6e5df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467581/normal_5fe4518c66cba.pdfIn PDF document text
    • https://vorevowupi.weebly.com/uploads/1/3/4/6/134633589/3364735.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386613/normal_6000cc8c544a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485572/normal_5fe8a010301ed.pdfIn PDF document text
    • https://xasibegofijuga.weebly.com/uploads/1/3/4/7/134731363/7680912.pdfIn PDF document text
    • https://zakesulukagog.weebly.com/uploads/1/3/4/4/134493448/patowukijawomexuxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://veniwusuj.pbworks.com/w/file/fetch/144641523/vulurowakujumaperovaposel.pdfIn PDF document text
    • http://vakerul.pbworks.com/f/bunesutafotimulalaku.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/f/how_to_code_a_game_script_roblox.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/zovikobusabik.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144425787/21062573550.pdfIn PDF document text
    • http://sisagexal.pbworks.com/w/file/fetch/144505131/94609385688.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 5660 bytes
SHA-256: d5962c782f1419e2e68979ae9c65d7ebbb491564ad03c00e80b55218df5a116a
font_01_sfnt_off00010881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10881 10252 bytes
SHA-256: efbc9665137ffb624a420c6b9a3ef8c6c835c16161d265ed379eb808035a72c5

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